Control method for hydraulic type continuously variable transmission
a technology of hydraulic type and transmission method, which is applied in the direction of fluid couplings, gearings, couplings, etc., can solve the problems of reducing operability and reducing output, and achieve the effect of improving the operability of vehicles
Inactive Publication Date: 2012-11-06
HONDA MOTOR CO LTD
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The method effectively suppresses harmful effects of reacceleration by maintaining target engine speed and torque output, improving vehicle operability by preventing rapid engine speed increases and maintaining stable torque transmission.
Problems solved by technology
However, as shown in FIG. 7, a rapid increase in engine speed NE causes an unexpected increase in speed ratio R (an unexpected decrease in output torque), so that desirable torque cannot be produced to cause a reduction in operability.
Method used
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Embodiment Construction
[0025]A preferred embodiment of the present invention will now be described with reference to the drawings.
[0026]FIG. 2 is a schematic block diagram of a vehicle 50 such as a motorcycle including a hydraulic type continuously variable transmission according to a preferred embodiment of the present invention. Basically, the hydraulic type continuously variable transmission according to this preferred embodiment may adopt the hardware of the hydraulic type continuously variable transmission 10 shown in FIG. 1. Accordingly, the reference numerals shown in FIG. 1 will be used as they are for the description of this preferred embodiment.
[0027]In the vehicle 50, torque generated in an engine 14 is transmitted through a centrifugal clutch 52 and a continuously variable transmission 10 to a rear wheel 54. The continuously variable transmission 10 is operated through a shifting actuator 36 by an ECU (electrical control unit) 56 mounted on the vehicle 50, thereby performing a shift operation....
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A control method for a hydraulic type continuously variable transmission for suppressing a harmful effect due to the reacceleration just after deceleration of a vehicle. In a hydraulic type continuously variable transmission, the operation of a shifting actuator is stopped to suspend the shift control (S7) when a throttle valve is rapidly opened just after fully closed (S4: Yes) and an engine speed NE [rpm] is being rapidly increased (S6: Yes). Accordingly, even when the actual engine speed NE becomes much greater than a target engine speed T_NE during reacceleration just after deceleration of a vehicle, unexpected shift control (upshifting) can be prevented, so that more desirable torque can be produced.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority under 35 USC 119 to Japanese Patent Application No. 2008-021722 filed on Jan. 31, 2008 the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a control method for a hydraulic type continuously variable transmission such that a high-pressure oil passage and a low-pressure oil passage are formed between a hydraulic pump and a hydraulic motor.[0004]2. Description of Background Art[0005]A hydraulic type continuously variable transmission is known as a continuously variable transmission for use in a vehicle such as a motorcycle (See, for example, Japanese Patent Publication No. Hei 7-56338, Japanese Patent Publication No. Hei 8-06797 and Japanese Patent Laid-open No. 2006-200727). FIG. 1 shows a hydraulic type continuously variable transmission 10 (which will be hereinafter referred to also as “con...
Claims
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IPC IPC(8): F16D31/02F16H59/24F16H59/42F16H61/40F16H61/4008F16H61/425
CPCF16H61/462F16H39/14F16H59/141F16H61/425F16H2059/6861F16H2059/363
Inventor USUKURA, YASUTAKANAKAMURA, KAZUHIKO
Owner HONDA MOTOR CO LTD